An alias is setup on your email server that masks multiple addresses behind it.
I wont say that an Alias and a Distribution List are exactly the same, but they function similarly. Distribution List's is the terminology used on Exchange (which outlook can connect to).
An alias could be support@mycompany.com
Any emails sent to support@mycompany.com would also send to:
bgreen@mycompany.com,
rmoore@mycompany.com,
tviles@mycompany.com.
I'm pretty sure you can also put another alias under an alias.
So you could make a Multi.MGTsupport@mycompany.com it could send to
management@partnercompany.com (management at partner company)
poberman@mycompany.com (internal management)
management@sistercompany.com (management at sister company)
support@mycompany.com
Sending an email to Multi.MGTsupport@mycompany.com notified your entire support group, your management and the 3 companies you are partnered/sistered with that need notification as well.
Notice that the partner and sister companies are using aliases and not direct emails. This way when people change positions in a company its up to the sister or partner company to change their alias or distribution list.
Outlook 2007 WITH Exchange does this with distribution lists.
If you have an Exchange server for your outlook. You are probably using this already. You just need distribution lists setup similar to the way alias's are and then swap the direct address for the distribution list addresses.
If you are using Outlook and using pop3 accounts on them, you'll need to use aliases that are setup on your companies web/email service.
Please note: Osticket can be used in a variety of business types.
I don't think this will in anyway resolve the original posters request.
Was the OP wanting to have the CC'd email through an email ticket used as secondary email for notifications?
My suggestion will only help those that use are trying to notify multiple static members from one or more organizations. This will not add any support if your trying to notify dynamic customers who fill in second or third email addresses.